Screwdriver



F. A. HOLT.

SCREWDRIVER.

APPLICATION FILED OCT. 2B, 1919.

Patented Oct. 12,1920.

ATTORNEYS UNITED s ArEs PATENT 3 OFFICE FREDERICK A. HOLT, o-E ARLI GTON, NEW JERSEY, Assrenon T JEWEL TOOL, SPECIALTY COMPANY; OF NEW YORK, 1v. Y., A CORPORATION or NEW YORK.

1 SCREWDRIVER.

To all whom it may concern:

Be it known that I, FREDERICK A. .HQLT, a citizen of the United States, and a resident of Arlington, in the county of Hudson and State of New Jersey, have invented a new.

and Improved Screwdriver, of which the following is a full, clear, and exact description.

This invention relates to improvements in screwdrivers, an object of'the invention being to provide improved means for connecting the tool with the handle.

A further object is to providewith a tool,

7 a tool holding. pin which also functions as a means for holding the toolreceiving nipple against rotary movement in the handle;

A further object is to provlde a screwdriver of extremely simple construction which willinsure a strong and rigid connection between the handle and the tool and which will permit the readyremoval of the tool notwithstanding the strain and stresses which may be put upon the same, and which will tend to. bind the tool in the handle.

lVith these and other objects in view the invention consists in certain novel features of construction, and combinations and arrangements of parts, as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings- Figure 1 is a view in longitudinal section illustrating my improvements; V

Fig. 2 is a View in cross-section on the line 2-2 of Fig. 1;

Fig. 3 is a view in elevation of one of the nipples removed; and v F ig.,l is a perspective view of the screwdriver 5. V

1 represents a cylindrical metal handle preferably having a milled or roughened surface and 2 and 3 represent metal nipples which are located in the ends of the handle and operate to receive the shanks 4 of tools 5. While I shall hereinafter refer to the tool 5 as a screwdriver, it is obvious that the structure may be utilized for supporting and operating other forms of tool and I do not wish to be limited to screwdriver tools, although it is the primary purpose of my device.

The nipple 2 at its outer end is of approximately the .same external diameter as the handle 1, but at its inner end is in the form of a tubular projection 6 which snugly fits other words, the hole Specification of Letters Patent. Patented Oct. 12 1920 Application filed was 28, 1919. Serial No. 333', 911.: v i

the bore of the handle 1 A pin 7 is pro ected through an opening 8' in the nipple 2 and is located at an angle to the longitudinal axls of thenipple and handle. In 8 is bored or formed in the nipple'at an incline or angle so that V the inner end of the pin is at an incline or angle and presents a beveled or sloping surface to receive thereagainstthe beveled or sloplng surface 9 of shank 4 of the tool 5.

This shank 9 is curved in cross-section c0n stituting approximately half ofa cylinder with a flat inclined surface forming a wedge which, whenmoved intoposition againstthe end of the pin 7, exerts a wed-ging action to hold the shank-in the handle. As the pin 7 is relatively OfSI-IN Lll diameter, a relatively small friction surface is presentedto the in- V clined face. 9 of the shank and while: a wedge ing action s had, there is no extensive frictional engagement as would he the caseif a relatively long wedge were provided in the handle This is important as it is, of course, desi-rableyto remove the tool. from the handle from time to time and while the pin serves to hold the shank, it doesnot prevent the removal of the tool because of the fact that its surface contact with the shank is relatively limited.

The shank 4 of the tool 5 is of slightly smaller diameter than the main portion of v the tool so as to provide an annular shoulder 13, and the nipple 2 has a counterbore 10 at its outer end receiving the tool 5 and providing a shoulder 11 which limits the inward movement of the shoulder 13 These shoulders 13 and 11 prevent any possibility ofthe tool being forced into the handle sufficiently far to prevent removalv of the tool, and furthermore the counterbore 10 receiving the tool 5 gives a stronger bearing surface for the handle on the tool.

As above stated, the pin 7 is positioned in the nipple at an angle to the longitudinal axis thereof and by reason of such position the outer end at one side of the pinwill eX- tend beyond the outer surface of'the tubular projection 6 so that when the nipple is forced into the handle, the projected end of the pin operates as a key to cut its way into the inner surface of the handle as shown somewhat exaggerated by the reference numeral 12. The pin therefore not only operates as a holding means for the shank of. the tool, but also secures the nipple in the that the nipple may have this counterborcr or not, as desired. V g a Various slight changes may be made in the general form and arrangement of parts described Without departing" from the invention, and hence I do not limit myself-to the precise details set forth but consider myself at liberty to make such changes and alterations as fairly fall Within the spirit and scope of the appended claims.

I claim:

1. 'A device of the character stated, comprising a handle, a tubular nipple in the handle, a pin located in the Wall of the nip pleand' positioned at an angle tothe longitudinal axis ofthe nipple, a tool, and a shank on the tool having an inclined face adapted to engage the inner end of the pin,

said pin at its outer end at one portion thereof projecting beyond the surface of the nipple and having locking engagement With the inner face of the handle.

2, A device of'the character stated, comprising a cylindrical metal handle, a nipple having its outer portion of approximately the same diameter as the-handle andhaving a tubular projection fitting Within the handle, said tubular projection having an opening in its Wall, a pin secured in said opening and located at an angle to the longitudinal axis of the nipple, the outer edge of said pin adapted When the nipple is moved into the handle to cut into the inner surface of the handle and hold the nipple against rotary movement in the handle, a tool, and a shank onthe tool having a beveled Wedge-shaped inner portion adapted toengage the inner end of the pin.v

the same diameter'a's the handle and having a tubular projection fitting Within the handle, said tubular projection having an openi on the tool having a beveled Wedge-shaped inner portion adapted to engage the inner I A'dGVlCGOf the character stated, comprising a cylindrical metal handle, a nipple having its outer portion of approximately end of the pin, said nipple and tool having annular shoulders limiting the inward movement of the tool in the handle.

FREDERICK i HOLT. 

